Paul van Ryssel (pseudonym of Dr. Paul Gachet) (1828-1909) The Old Walnut Tree (Auvers-sur-Oise). Etching. At sight : 230 x 170. Good proof on vellum, signed "Van Ryssel" in sepia ink on the reverse and annotated at the foot. Several traces of folds and small accidents on the surface (mainly perceptible on the reverse). All margins. Framed.